Water-tube boiler or the like



Oct. 20,1925. 1,558,379

R. M GREGOR 'WAIER TUBE BOILER OR THE LIKE Filed March 14, 1922 2 Sheets-Shoot .1.

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Oct. 20, 1925. 1,558,379

R. MGGREGOR WATER TUBE BOILER OR THE LIKE File March 14, 1922 2 Sheets-Sheet 2 lzz/velziazz Patented Oct. 20, 1925.

UNITED STATES 1,558,379 PA EN F Bonner MGGREGOR, OFILFORD, ENGLAND, as -srenona niano'r nivnmnsnn SIGNMENTS, or ONE-THIRD TO THE STIRLING- Bo LEn COMPANY, LIMITED, or LON- non, ENGLAND, nnn'rwo-rmans T0 BABeocK & wILoox LIMITED, or LONDON,

ENGLAND.

WATER-TUBE BoILER on THE LIKE.

Application filed March 14, 1922. Serial No. 543,751.

To all whom it may concern:

Be it known that I, Bonner MoGnEGoR, a subject of the King of Great Britain and Ireland, and residing at 158 Balfour Road, Ilford, in the county of Essex, England, have invented certain new and useful Improvements in ater-Tube Boilers or the like, of which the following is a specification.

The present invention relates to water tube boilers of the type in which the water tubes are arranged in a bank between two headers which are connected by pipes with steam or water drums or the like. In such boilers difliculty is sometimes experienced in ensuring an efficient supply of water to the lower tubes which are nearest to the fire. Further it is usual, in order to extract the maximum amount of heat from the flue gases to place the tubes in staggered relation so that each tube is situated to one side of those above and below it, This necessitates the headers being made of zigzag form in the case in which there is a separate header at each end of a substantially vertical row of tubes, or else requires the holes for the tubes to be drilled in staggered relation in the case in which a single header only is employed at each end of the bank.

The present invention has for its object to avoid this zigzag arrangement which entails expense and inconvenience in manufacture and upkeep, and to ensure an adequate supply of water to all the tubes.

The invention broadly consists in the improved water tube boiler hereinafter fully described and afterwards specifically defined in the appended claims.

Two forms of the invention are illustrated by way of example in the accompanying drawings, in which Figure 1 is a side view of a complete boiler, the steam and water drum being shown in section;

Figure 2 is a section on the line AB of Figure 1, and

Figure 8 is a view similar to Figure 1 of a modification.

In the form of boiler illustrated in Figures 1 and 2 in which the steam drum 1 is placed with its axis at right angles to that of the water tubes 2, the latter are divided into upper and lower banks as indicate-d. In each bank the tubes are arranged, as indicated in Figure 2, in a series of vertical rows,'these rows being arranged in mutually staggered relationship, thus ensuring the maximum extraction of heat from the flue gases in the well known manner;

It will be observed, however, that in each header or series of headers 3, the holes for the tubes 2 are drilled in a strictly vertical line, the zigzag arrangement necessary in known forms of boiler being thus avoided. Thespaces occurring between the vertical rows in the upper bank enables the pipes 4 connecting the lower headers 3 with the steam drum 1 to pass between the tubes of the upper bank so that no diiiiculty occurs in connecting the lower bank with the steam and water drum. I

There are thus two distinct and separate circuits for the'passage of inlet water to the headers and for the discharge of steam and water from the outlet headers, thus ensuring that the lower tubes'are as adequately supplied with water as those above.

Figure 3 illustrates a precisely similar arrangement of water tubes 2 to that shown in Figures 1 and 2, but depicts a boiler of thetype in which the steam drum-1 is arranged with its axis in the same vertical planeas that of the banks of tubes 2.

It will be seen that by use of the arrangement of tubes according to this invention it is possible not only to retain the straight watertub es placed in staggered relationship so as to ensure the maximum efficiency, but that in the case of the connecting tubes 4 curved portions are not necessaryin order to avoid the water tubes 2.

If desired, in order to secure that circulation of water from the feed water inlet 5 shall occur first through the upper bank, and then through the lower, a bafiFle plate 6 may be fitted within the drum 1 to extend over the whole or a part of its axial length in the example shown in Figures 1 and 2, or of its width in the case of the boiler illustrated in Figure 3.

Claims:

1. In a steam boiler, an upper steam and water drum, an upper and a lower bank of horizontally inclined water tubes, upper uptake and downtake water chambers connected to the ends of the tubes of the upper bank and to said drum, lower uptake and downtake water chambers connected to the end-softhei tube's of the lowerlbankhnd located between the planes of the inner faces of the upper water chambers and connectionsbetween 'the'lower watercha'rnbers and the drum, comprising tubes "having Imperforate walls and "extending upwardly from the tops of said lower water-chambers and between tubes of said upper'bank an'd'between the inner faces of said upper water chambers.

.2. 'IID2178 663111bOllGlgiiHljllPPBl steam and wa ter drum; an zupperrr-bankvof horizontally inclined 'water tubes with'the tubes in each "vertical crow :thereof 1 in "VGICtlGiLli alignment,

an nptake-anda downtakegheaderconnected *.'to "the ends of the tubespineach vertical lOWV SEl-ld VGLtIGHl rows being relatively widely spaced, ajlo'wer bank of horizontally inclined :water. tubes with the tubes thereof :in each vertical row thereof in vertical valignment, fll1d' 21(l11Of xthe wertical rows of said lower bank' between the vertical dines ofcenters of a:pair ofverticalrows of the upper .bank, anyuptake =and a downtake header connected to' the ends -of:the=tubes in each vertioallrow of therlower bank and'located between the planes oftheinner faces of the upper uptake and downtake :headers,

- and-tubes having imperforate walls connected to the 1 top of each of I said lower 1 uptake and clowntak'e headers 'and I extending through the spaces between *the Vertical rows of tubes of the upper bank and between the inner-faces of the -:upper uptakevand downtake headers and connected to said drum.

3. 111 asteam boiler, an upper =stean1 and water drum, an jupp'e'r bank ofhorizontally inclined water tubes with .ithetubes in; each f;

vertical row thereof in vertical alignment,

an uptake and 'a doWntake headericonnected to the" endsofitheitubes in eachivertical 'row,

*said verticalfrows being relatively widely spaced, :a lower i ba'n'k of horizontally incline'd water tubes *with Lthe' tubes thereof in v eaeh"vertical -r'ow thereofain vertical alignment, and each of the vertical rows of said lower bank between the vertical lines of centers of '-'a {pair of vertical rows or the upper bank, -a'n uptake -'-and-'-a downtake header connected to the endsof-the tubes in each vertical. row of the lowerba irlrand lo- 'cated'between the planes of the inner faces 10f-theupperuptake and downtake headers,

and tubes having imperforate walls connected to the topofeach of saidvlower uptake -and 'downtake headers and extending through the spaces between the ,vertical rows of tubes'of the upper bank and. between the inner faces of the .upper uptakerand downtake headers and .connected to said drum sald nnperiorate tubes being. circular in cross-section and I removed :from the inner faces of the adjacent upper uptake'and downtake o headers.

41. In axsteam boiler,- an upper steam and -water drum,.-a-n upp'erbankof horizontally inclined tubes arranged 1n vertical rows with the tubes in each row in vertical alignment and-said vertical rows relatively cal'lines of centers of apair of rows'of the upper bank, headers having fiat sides a and connected torthe ends of each of-said vertical row-s, said last-named headers being located between-the planes of the inner faces of the upper headers, and connections having imperforate wallsFbetween the lower headers and the drum and extending through the 'spaces between the vertical-rows of tubes in :the upper bank.

In testimony whereof -I "have signed. .my

Ename to this specification.

ROBERT :MOGREGOR. 

